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Now showing items 91-100 of 451
Study of carbonate rocks of the khuff and Jubaila formations , saudi arabia by Thermal derivatography
(
Qatar University
, 1997 , Article)
Thermal derivatographic analysis of the Khuff and Jubaila carbonate rocks shows that calcite and / or dolomite (of calcitic type) are the main constituent minerals. Their differential thermal and thermogravimetric behaviours ...
Renal Structural And Physiological Alterations Subsequent To Unilateral Ureteral Obstruction
(
Qatar University
, 1992 , Article)
Complete obstruction of the right ureter of male rabbits for eight weeks resulted in filling of the obstructed kidney with clear urine, no precipitation or stone formation. The calyces and pelvis were distinctly dilated ...
A Preliminary Check-List Of Benthic Mollusca On The Qatari Coasts, Arabian Gulf
(
Qatar University
, 1994 , Article)
In this paper, an annotated checklist of the benthic marine Mollusca collected from Qatari coasts, Arabian Gulf, is presented. Localities and habitats are given for the common families of the recorded groups. Gastropoda ...
Phytochemical investigation of thymus decassatus l. 1. Flavonoids and volatile oil
(
Qatar University
, 1993 , Article)
Investigation of the flavonoidal constituents of Thymus decassatus, L. resulted in the isolation and identification of thymonin, 5,6,4'-trihydroxy-7,3'-dimethoxyl flavone, and apigenin. Investigation of the volatile oil ...
Pullulan production from sugar beat molasses
(
Qatar University
, 1997 , Article)
Sugar beet molasses was used as the substrate for the production of pullulan with Aureobasidum pullulans ATCC 42023. In addition biomass, residual sugar and final pH of the culture medium were investigated. In comparing ...
Window Analysis Optimization Of Gas Chromatographic Separation Using Different Polarity Packed Columns
(
Qatar University
, 1996 , Article)
Window diagram theory has been described by Purnell and his research team in various publications. In this paper we apply this theory to optimize a separation of complex mixture containing propylene oxide, 1-hexene, ...
Thermal Acclimation In The Resting Metabolism Of The Nocturnal Gecko, Hemidactylus Flaviviridis
(
Qatar University
, 1996 , Article)
Hemidactylus flaviviridis was acclimated to two temperature regimes (20 and 30°C). The resting metabolic rates (ml g1 h"1) were determined at 20, 25,30 and 35°C, using constant pressure manometric respirometers. The 20°C- ...
Seismic reflection coefficient parameter-theoretical and Practical approach
(
Qatar University
, 1994 , Article)
In this study, the effect of porosity and pore filler on the reflection coefficient parameter (R), are well deduced and some mathematical expressions were developed. This leads to the establishment of new expression of (R) ...
Haemogregarines of geckos in egypt, together with a description of haemogregarina helmymohammedi n.sp.
(
Qatar University
, 1995 , Article)
Three species of geckos collected from various localities in Egypt were examined for protozoan blood parasites. Haemogregarines were reported in all the three species of geckos. Problems of the generic and specific ...
Evaluation of Some Local Egyptian Plants as a Source of Chlorophyll Pigments
(
Qatar University
, 1994 , Article)
Four plant materials viz. Spinacia oleracae Linn, (spinach), Beta vulgaris Limm (chard), Medicago sativa Linn, (alfalfa) and Petroselinum sativum Hoff. (parsely) were studied as local sources for the preparation of chlorophyll ...